朝鲜半岛南部三维地壳速度结构成像
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摘要
对多震相走时层析成像方法进行改进和优化,使用朝鲜半岛陆地和近海的地震记录,对朝鲜半岛南部(34.5°N～39°N,125°E～130°E)进行地震波走时反演,获得了本研究区的三维速度结构成像结果.分析了沉积层、基底、上地壳、康腊面、下地壳和莫霍面的特征.研究了不同地质区的深部结构的主要差别、主要断裂特征、海陆交界的地壳特征等.可以发现京畿山地与沃川褶皱带、太白山褶皱带、临津江褶皱带深部结构的差异尤为明显.
The method “MUltiphase Traveltime Inversion(MUTI)" has been improved and optimized. We conducted 3-D velocity tomography of the southern Korean Peninsula within 34.5°N～39°N, 125°E～130°E by using seismic data on land and near ocean. The velocity structure features of sediment, basement, upper crust, lower crust, Conrad and Moho interfaces were analyzed. We found obvious velocity differences among different geological provinces, especially the Kyonggi Massif and Okchon Fold Zone, Kyonggi Massif and Taebaesan Fold Zone, Kyonggi Massif and Imjingang Fold Zone. The velocity difference between sea and land is obvious.
The method “MUltiphase Traveltime Inversion(MUTI)" has been improved and optimized. We conducted 3-D velocity tomography of the southern Korean Peninsula within 34.5°N～39°N, 125°E～130°E by using seismic data on land and near ocean. The velocity structure features of sediment, basement, upper crust, lower crust, Conrad and Moho interfaces were analyzed. We found obvious velocity differences among different geological provinces, especially the Kyonggi Massif and Okchon Fold Zone, Kyonggi Massif and Taebaesan Fold Zone, Kyonggi Massif and Imjingang Fold Zone. The velocity difference between sea and land is obvious.
引文
[1]Aki K,Lee W H.Determination of three dimensional velocity anomalies under a seismic array using first P arrival from local earthquakes,1.A homogeneous initial model.J.Geophys.Res.,1976,81(B1):4381～4399
[2]Arlitt R,Kissling E,Ansorge J,TOR Working Group.Three-dimensional crustal structure beneath the TOP array and effects on teleseismic wavefronts.Tectonophysics,1999,31:309～319
[3]Backus G E,Gilbert F.Numerical applications of a formalismfor geophysical inverse problems.Geophys.J.R.Astr.Soc.,1967,92:125～142
[4]Bijward H,Spakman W,Engdahl E.Closing the gap between regional and global travel time tomography.J.Geophy.Res.,1998,103:30055～30078
[5]Crosson R D.Crustal structure modeling of earthquake data,1.Simultaneous least square estimation of hypocenters and velocity parameters.J.Geophys.Res.,1976,81:3036～3046
[6]Hawley B W,Zandt G,Smith R B.Simultaneous inversion for hypocenters andlateral velocity variations:aniterative solution witha layered model.J.Geophys.Res.,1981,86:7073～7086
[7]Kissling E,Husen S,Huslinger F.Model parameterizationinseismic tomography:a choice of consequece for the solution quality.Phys.Earth.Planent.Inter.,2001,123:89～101
[8]Koch M.Simultaneous inversion for3-D crustal structure and hypocentres including direct,refracted and reflected phase-Ⅰ.Development validation and optimal regularization of the method.Ⅱ.Application to the northern Rhine Graben/Rhenish Massif Region,Germany.Ⅲ.Application to the southern Rhine Graben seismic region,Germany.Geophys.J.Int.,1993,112:385～447
[9]Lees L M,Crosson RS.Tomographic inversionforthree-dimensional velocity structure at Mount St.Helens using earthquakes data.J.Geophys.Res.,1989,94:5716～5728
[10]刘福田.震源定位和速度结构的联合反演(Ⅰ)——理论和方法.地球物理学报,1984,27(2):167～175Liu F T.Simultaneous inversion of earthquake hypocenters and velocity structure(I)—Theory and method.Chinese J.Geophys.(in Chinese),1984,27(2):167～175
[11]Sambridge MS.Non-linear arrival time inversion:constraining velocity anomalies by seeking smooth models in3-D.Geophys.J.Int.,1990,102:633～667
[12]Tarantola A.Inverse Problem Theory,Methods for Data Fitting and Model Parameter Estimation.NewYork:Elsevier,1987
[13]Thomson CI,Gubbins D.Three-dimensional lithospheric modelingat NORSAR:linearity of the method and amplitude variations from anomalies.Geophys.J.R.Astr.Soc.,1982,71:1～36
[14]Thurber C H.Earthquakelocations andthree-dimensional structurein the Coyote Lake area,Central California.J.Geophys.Res.,1983,88:8226～8236
[15]Walck MC,Clayton R W.P-wave velocity variations inthe Coso-region,California,derived fromlocal earthquake travel times.J.Geophys.Res.,1987,92:393～405
[16]Zhao D,Hasegawa A,Horiuchi S.Tomography imaging of P and S wave velocity structure beneath northeastern Japan.J.Geophys.Res.,1992,97:19909～19928
[17]KimS J,KimS G.Astudy onthe crustal structure of south Korea by using seismic waves.J.Korean Inst.Mining Geol.,1983,16:51～61
[18]KimS K.The crustal structure of the southern part of Korea peninsula.J.Geol.Soc.Korea,1995,31:393～403
[19]Kwon B D,Yang S Y.A study on the crustal structure of the southern Korean Peninsula through gravity analysis.J.Korean Inst.Mining Geol.,1985,18:309～320
[20]Choi K-S,Shin Y-H.Isostasy in and around the Korean Peninsula by analyzing gravity and topography data.J.Geol.Soc.Korea.,1996,32:407～420
[21]郝天珧,Sun Mancheol,王谦身等.根据重力数据研究黄海周边断裂带在海区的延伸.地球物理学报,2002,45(3):385～397Hao TY,Suh M,Wang Q S,et al.Astudy on the extension offault zone in YellowSea andits adjacent areas based on gravity data.Chinese J.Geophys.(in Chinese),2002,45(3):385～397
[22]Chang S-J,Bang C-E.Crustal structure in southern Korea from joint analysis of teleseismic receiver function and surface-wave dispersion.Bull.Seism.Soc.Amer.,2005,95(4):1516～1534
[23]So Gu Kim,Qinghe Li.3-D Crustal velocity tomography in the central Korean Peninsula.Econ.Enviom.Geol,1998,31(3):235～247
[24]李清河,金昭九,张元生.多震相走时和波形三维地震成像方法在朝鲜半岛和祁连山地壳结构研究中的应用.CT理论与应用研究,1998,7:26～28Li Q H,KimS G,Zhang YS.The3-Dseismic tomography method by using Multiphase Traveltime and Waveformand its application on the crustal structure of Korean Peninsula and Qilianshan Mt.Compu.Tomogr.Theo.Appl.(in Chinese),1998,7:26～28
[25]李清河,张元生,盛国英,范兵.南北地震带北段速度结构与大地震.见:石特临等主编.昌马地震与七级强震研究.北京:地震出版社,1994.129～136Li Q H,Zhang YS,Sheng G Y,Fan B.The3-Dseismic velocity structure inthe Northern segment of North-South Seismic Zone.In:Shi T L,et al,eds.Changma Earthquake and Research onM7Earthquakes.Beijing:Seismological Press,1994.129～136
[26]张元生,李清河,盛国英等.河西走廊中部地壳三维速度结构.见:石特临等主编.河西祁连山中段地震危险性基础研究.北京:地震出版社,1994.159～169Zhang YS,Li Q H,Sheng G Y,et al.The3-D seismic velocity structure in Hexi Corridor,China.In:Shi TL,et al,eds.Basic Research on Earthquake Risk in the Middle Segment of Qilianshan Mountain.Beijing:Seismological Press,1994.159～169
[27]KimS K,Jung B H.The crustal structure of the southern part of Korea.J.Korean Inst.Mining Geol.,1985,18:151～157
[28]KimSo Gu,Seoung Kyu Lee.Crustal modelling for the southern parts of the Korean Peninsula using observational data and ray method.Kor.Inst.Min.and Energy Res,1994,31:549～558
[29]So Gu Kim,Fuchun Gao.Korean Earthquake Catalogue.Hanyang University,1995
[2]Arlitt R,Kissling E,Ansorge J,TOR Working Group.Three-dimensional crustal structure beneath the TOP array and effects on teleseismic wavefronts.Tectonophysics,1999,31:309～319
[3]Backus G E,Gilbert F.Numerical applications of a formalismfor geophysical inverse problems.Geophys.J.R.Astr.Soc.,1967,92:125～142
[4]Bijward H,Spakman W,Engdahl E.Closing the gap between regional and global travel time tomography.J.Geophy.Res.,1998,103:30055～30078
[5]Crosson R D.Crustal structure modeling of earthquake data,1.Simultaneous least square estimation of hypocenters and velocity parameters.J.Geophys.Res.,1976,81:3036～3046
[6]Hawley B W,Zandt G,Smith R B.Simultaneous inversion for hypocenters andlateral velocity variations:aniterative solution witha layered model.J.Geophys.Res.,1981,86:7073～7086
[7]Kissling E,Husen S,Huslinger F.Model parameterizationinseismic tomography:a choice of consequece for the solution quality.Phys.Earth.Planent.Inter.,2001,123:89～101
[8]Koch M.Simultaneous inversion for3-D crustal structure and hypocentres including direct,refracted and reflected phase-Ⅰ.Development validation and optimal regularization of the method.Ⅱ.Application to the northern Rhine Graben/Rhenish Massif Region,Germany.Ⅲ.Application to the southern Rhine Graben seismic region,Germany.Geophys.J.Int.,1993,112:385～447
[9]Lees L M,Crosson RS.Tomographic inversionforthree-dimensional velocity structure at Mount St.Helens using earthquakes data.J.Geophys.Res.,1989,94:5716～5728
[10]刘福田.震源定位和速度结构的联合反演(Ⅰ)——理论和方法.地球物理学报,1984,27(2):167～175Liu F T.Simultaneous inversion of earthquake hypocenters and velocity structure(I)—Theory and method.Chinese J.Geophys.(in Chinese),1984,27(2):167～175
[11]Sambridge MS.Non-linear arrival time inversion:constraining velocity anomalies by seeking smooth models in3-D.Geophys.J.Int.,1990,102:633～667
[12]Tarantola A.Inverse Problem Theory,Methods for Data Fitting and Model Parameter Estimation.NewYork:Elsevier,1987
[13]Thomson CI,Gubbins D.Three-dimensional lithospheric modelingat NORSAR:linearity of the method and amplitude variations from anomalies.Geophys.J.R.Astr.Soc.,1982,71:1～36
[14]Thurber C H.Earthquakelocations andthree-dimensional structurein the Coyote Lake area,Central California.J.Geophys.Res.,1983,88:8226～8236
[15]Walck MC,Clayton R W.P-wave velocity variations inthe Coso-region,California,derived fromlocal earthquake travel times.J.Geophys.Res.,1987,92:393～405
[16]Zhao D,Hasegawa A,Horiuchi S.Tomography imaging of P and S wave velocity structure beneath northeastern Japan.J.Geophys.Res.,1992,97:19909～19928
[17]KimS J,KimS G.Astudy onthe crustal structure of south Korea by using seismic waves.J.Korean Inst.Mining Geol.,1983,16:51～61
[18]KimS K.The crustal structure of the southern part of Korea peninsula.J.Geol.Soc.Korea,1995,31:393～403
[19]Kwon B D,Yang S Y.A study on the crustal structure of the southern Korean Peninsula through gravity analysis.J.Korean Inst.Mining Geol.,1985,18:309～320
[20]Choi K-S,Shin Y-H.Isostasy in and around the Korean Peninsula by analyzing gravity and topography data.J.Geol.Soc.Korea.,1996,32:407～420
[21]郝天珧,Sun Mancheol,王谦身等.根据重力数据研究黄海周边断裂带在海区的延伸.地球物理学报,2002,45(3):385～397Hao TY,Suh M,Wang Q S,et al.Astudy on the extension offault zone in YellowSea andits adjacent areas based on gravity data.Chinese J.Geophys.(in Chinese),2002,45(3):385～397
[22]Chang S-J,Bang C-E.Crustal structure in southern Korea from joint analysis of teleseismic receiver function and surface-wave dispersion.Bull.Seism.Soc.Amer.,2005,95(4):1516～1534
[23]So Gu Kim,Qinghe Li.3-D Crustal velocity tomography in the central Korean Peninsula.Econ.Enviom.Geol,1998,31(3):235～247
[24]李清河,金昭九,张元生.多震相走时和波形三维地震成像方法在朝鲜半岛和祁连山地壳结构研究中的应用.CT理论与应用研究,1998,7:26～28Li Q H,KimS G,Zhang YS.The3-Dseismic tomography method by using Multiphase Traveltime and Waveformand its application on the crustal structure of Korean Peninsula and Qilianshan Mt.Compu.Tomogr.Theo.Appl.(in Chinese),1998,7:26～28
[25]李清河,张元生,盛国英,范兵.南北地震带北段速度结构与大地震.见:石特临等主编.昌马地震与七级强震研究.北京:地震出版社,1994.129～136Li Q H,Zhang YS,Sheng G Y,Fan B.The3-Dseismic velocity structure inthe Northern segment of North-South Seismic Zone.In:Shi T L,et al,eds.Changma Earthquake and Research onM7Earthquakes.Beijing:Seismological Press,1994.129～136
[26]张元生,李清河,盛国英等.河西走廊中部地壳三维速度结构.见:石特临等主编.河西祁连山中段地震危险性基础研究.北京:地震出版社,1994.159～169Zhang YS,Li Q H,Sheng G Y,et al.The3-D seismic velocity structure in Hexi Corridor,China.In:Shi TL,et al,eds.Basic Research on Earthquake Risk in the Middle Segment of Qilianshan Mountain.Beijing:Seismological Press,1994.159～169
[27]KimS K,Jung B H.The crustal structure of the southern part of Korea.J.Korean Inst.Mining Geol.,1985,18:151～157
[28]KimSo Gu,Seoung Kyu Lee.Crustal modelling for the southern parts of the Korean Peninsula using observational data and ray method.Kor.Inst.Min.and Energy Res,1994,31:549～558
[29]So Gu Kim,Fuchun Gao.Korean Earthquake Catalogue.Hanyang University,1995
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